[jira] Assigned: (DERBY-2490) Clarify transaction management in LanguageConnectionContext.

["Kathey Marsden (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/DERBY-2490?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Kathey Marsden reassigned DERBY-2490:
-------------------------------------

    Assignee:     (was: Daniel John Debrunner)

> Clarify transaction management in LanguageConnectionContext.
> ------------------------------------------------------------
>
>                 Key: DERBY-2490
>                 URL: https://issues.apache.org/jira/browse/DERBY-2490
>             Project: Derby
>          Issue Type: Sub-task
>          Components: SQL
>            Reporter: Daniel John Debrunner
>
> LanguageConnectionContext has these four methods (as well as other commit/rollback methods) to manage transactions and specifically nested transactions.
> void beginNestedTransaction(boolean readOnly) throws StandardException;
> void commitNestedTransaction() throws StandardException;
> TransactionController getTransactionCompile();
> TransactionController getTransactionExecute();
> getTransactionCompile() returns the same as getTransactionExecute() if not in a nested transaction.
> nested transactions started out as "compile time" transactions  but are now used at runtime, for example in permission lookup and identity columns(?),
> thus the name getTransactionCompile() can confuse readers.
> A cleaner api might be to just have a single getTransaction() method that returns the current transaction, which is main transaction (non-nested) except
> between calls to
>    beginNestedTransaction() 
>   commitNestedTransaction()
> I think that is the logic today, one one transaction is active, either the nested one of the main one.

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